One of the things you need to be aware of is that barring the “undo” function there are some changes to an audio file that you can’t take back. That is to say, once you hit save, the file is forever changed. The changes can be anything from trimming to applying audio processing.
What modes that cause destructive vs. non-destructive editing vary from DAW to DAW.
In Adobe Audition: Multitrack Mode is non-destructive editing. What it’s doing is creating a copy of the original file that you edit so if you cut or trim the end your original file is still intact.
However, in Waveform mode your changes are destructive. If you cut a piece of audio, the audio is gone. You’re immediately editing the original file.
Don’t get me wrong, it’s important for you not to confuse Destructive vs. Non-Destructive with being able to use the undo.
Now that we’ve talked about signal chains we should talk about destructive and non-destructive editing.